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Piston orientation question..
Posted by: Grandpacorvair ()
Date: March 02, 2018 03:11PM

Ever have one of those days? I did, today... I won't bore with everything that went South on the rebuilt engine project, but I do have a question..

Picked up the cylinders, rods and pistons from the machine shop today. So far the cylinders seem ok. BUT I also had him mount my rods on the new, Clarks pistons.

First - 2 of the 6 are mounted with the pistons upside down. Meaning to install them correctly (arrow pointing to the front of the car) they would end up with the number on the bottom. Can that be done? Possible consequences?

Second - 5 of the 6 have the rod mounted off center on the wrist pin. It's enough that you can see it when physically centering the pin in the piston. Haven't speced it yet but it's a lot... consequences?

One piston asm is ok...

Kerry Borgne
Birmingham, Michigan

1963 Spyder Convertible



Edited 1 time(s). Last edit at 03/02/2018 04:25PM by MattNall.

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Re: Piston orenitation question..
Posted by: MattNall ()
Date: March 02, 2018 03:22PM

Numbers mean nothing..rods are not offset...

When you move the pin back and forth does it protrude out the edge of the piston?





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Re: Piston orenitation question..
Posted by: davemotohead ()
Date: March 02, 2018 03:29PM

So glad I have a Machine shop that knows corvairs! You need to teach your guys whats up, take the stuff back and make them do it right.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

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Re: Piston orientation question..
Posted by: Grandpacorvair ()
Date: March 03, 2018 05:26AM

Mattnail,

Here is a picture of one of the piston asms.

Kerry Borgne
Birmingham, Michigan

1963 Spyder Convertible

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Re: Piston orientation question..
Posted by: JimBrandberg ()
Date: March 03, 2018 06:55AM

You have to decide whether the stress of heating the rod (and everything else) to move the pin outweighs the offset. Looking at where the piston and pin is on each end when the rod is centered would be the deciding view. I find Machine Shops can be a little cavalier in this operation. You could post more pictures but I'm not going to make the call. I'd be curious what other's opinions might be.

I don't usually press on pistons myself unless I'm just ruining them when getting apart anyway. I suppose I could do it but it just never seems to come up.

Numbers up looks good with the top cover up but that's the only consideration. I might have the same numbers in a set when choosing based on weight to start with.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: Piston orientation question..
Posted by: TerribleTed ()
Date: March 03, 2018 08:14AM

That rod looks like it has been heated very hot. My machinists have wrist pin presses for mounting wrist pins into rods and pistons and generally involve no heating at all.

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Re: Piston orientation question..
Posted by: davemotohead ()
Date: March 03, 2018 08:22AM

I think you are Close to Ken Hand? Maybe give him a call to help you out?





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Piston orientation question..
Posted by: jjohnsonjo ()
Date: March 03, 2018 09:21AM

That guys didn't use a rod oven, just hit it with a torch.

J.O.

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